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// 声明类型为myint的新数据类型,int的别名
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type myint int
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// 定义结构体
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type Book struct {
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  title  string
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  author string
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}
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func main() {
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  var a myint = 10
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  fmt.Printf("a=%v, type of a=%T\n", a, a)
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  var book1 Book
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  book1.title = "Golang"
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  book1.author = "Shai"
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  printBook(book1)
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  fmt.Printf("printBook-book1=%v\n", book1)
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  changeBook(book1)
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  fmt.Printf("changeBook-book1=%v\n", book1)
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  changeBook1(&book1)
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  fmt.Printf("changeBook1-book1=%v\n", book1)
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}
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func printBook(book Book) {
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  book.title = "printBookGolang"
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  fmt.Printf("book=%v\n", book)
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}
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func changeBook(book Book) {
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  book.title = "ChangeGolang"
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}
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func changeBook1(book *Book) {
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  book.title = "PointerGolang"
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}
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-------------
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a=10, type of a=main.myint
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book={printBookGolang Shai}
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printBook-book1={Golang Shai}
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changeBook-book1={Golang Shai}
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changeBook1-book1={PointerGolang Shai}

1
type Hero struct {
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  // 首字母大写，表示该属性是对外能够访问的
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  Name string
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  Ad   int
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  // 首字母小谢，只能类的内部访问
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  level int
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}
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// Show方法绑定到Hero结构体
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func (this Hero) Show() {
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  fmt.Println("Name = ", this.Name)
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  fmt.Println("Ad = ", this.Ad)
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  fmt.Println("Level = ", this.level)
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}
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func (this *Hero) GetLevel() int {
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  return this.level
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}
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func (this *Hero) SetName(newName string) {
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  fmt.Println("SetName = ", newName)
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  this.Name = newName
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}
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func main() {
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  hero := Hero{Name: "Superman", Ad: 100, level: 999}
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  hero.Show()
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  fmt.Println("Hero's Level is ", hero.GetLevel())
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  hero.SetName("Zhangsan")
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  hero.Show()
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}
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-----------------
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Name =  Superman
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Ad =  100
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Level =  999
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Hero's Level is  999
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SetName =  Zhangsan
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Name =  Zhangsan
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Ad =  100
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Level =  999